Great Plains NH3 Safety User Manual
Page 19
Great Plains Manufacturing, Inc.
Ammonia Nurse Tanks
15
2013-07-15
407-551M
Refer to Figure 11 (some components shown exploded for
clarity - never remove any except the outlet cap).
A64 Outlet:
The inlet end of the nurse tank hose attaches to this
fitting, which is located at the withdrawal valve
(which itself may not be on the tank top. See
page 16).
This may be a male Acme fitting, and if so should
have a an Acme cap on it when the hose is
disconnected. This Acme fitting may be a different
size than the implement 1
3
⁄
4
-4 fitting, and if so, will
only accept one end of the hose.
If the hose connects with an NPT fitting, it is not
intended for routine disconnection.
A65 Excess Flow Valve:
This (usually time-dated) fitting may not be present,
or may be internal to the withdrawal valve
. Its
function is to substantially obstruct flow if an
unusually high flow is detected, such as a complete
shearing of the hose or a major breach in the hose.
If present, and correctly specified for the hose size
and maximum application rate, field operators do
not normally
a
interact with this fitting.
Ammonia Release Hazard:
Do not approach a breached hose. In the event of a hose
breach, an excess flow valve does not completely shut off
NH
3
flow. It reduces flow, which may still be a substantial
fraction of a gallon per minute. This flow may or may not
be marked by a visible cloud. This flow rate is beyond the
capabilities of field PPE
. Summon emergency
responders.
Note: An excess flow valve may also be present at
the liquid filler valve
or the vapor
valve
.
a. It is worthwhile to learn if an excess flow valve is installed, how to know if it has engaged, and what the reset procedure is. Also, an
incorrect configuration of undersize I.D. fittings on the outlet side of an excess flow valve could result in the valve failing to operate in
the event of a breach. If any reducer bushing or fitting present, reconsider accepting the nurse tank.
b. PPE: Personal Protective Equipment
Figure 11
Nurse Tank Outlet Fittings
31574
A64
A66
A65
A67
A70
A66
A66
A67
A70